This product is laser cut which means its specifications are very accurate.The tool steel is very hard. I had a BB that required the use of a rubber mallet on tool to loosen it. The wrench handled it and still looks brand new. I used it on 2 Shimano BB's and the fit was absolutely perfect. It does not get any better !!!

I wore out the BB on my 19 year old commuter bike, so I ditched the old Deore LX crankset and upgraded to a new Deore with a hollowtech crank. My local shop wanted $40 to install the crankset, but I bought the wrench at Nashbar for [$] and did it myself.